4.5 billion years ago, the Earth was formed. At that time, the young Earth was a hot sphere of molten rock. This volcanic rock forms the basis today for a technical yarn unlike any other: basalt yarn. You can recognize it by the bronze-colored sheen it naturally emits, clearly setting it apart.
Basalt fibers can be found in a surprisingly wide range of sectors: from sports to maritime applications, protective clothing, the construction industry, and even road building. In fashion, however, the yarn is hardly used. Cotton, linen, wool, and synthetic fibers remain the norm there. Basalt therefore mainly plays a role in sectors where technical performance, safety, and durability are decisive. In Belgium, Basaltex is a true pioneer. Although the company is still small, its activities prove that basalt fiber is not an exotic research material, but one with concrete production and commercial applications—also here in Belgium.
What is basalt?
Basalt is a dark, fine-grained rock formed by volcanic activity. It consists mainly of plagioclase and pyroxene minerals and is the most common volcanic rock on Earth. According to various sources, it covers more than 90% of the ocean floor. It is also abundant in areas shaped by ancient lava flows. Basalt is formed when magma—rich in iron and magnesium but low in silica—rises from the Earth’s crust and cools rapidly.
How do you make yarn from stone?
Making yarn from stone seems almost impossible. After all, yarns are soft and flexible, while stone is exactly the opposite. The process therefore begins with melting basalt rock at temperatures above 1500°C. From this melt, the yarn is extruded: it is pressed through a die, creating thin yarn filaments.
Extremely strong
Basalt is praised for its enormous tensile strength. Thanks to innovative (weaving) techniques, it is also possible to create a multiaxial fabric that can withstand forces from multiple directions. For this reason, it is often used as a reinforcing material, for example in the construction of pleasure yachts, or in applications where breakage must be absolutely avoided, such as skis or padel rackets.
Resistant to extreme heat
One of the major advantages of basalt fabrics is their ability to withstand very high temperatures. They are used, among other things, as fire barriers in aircraft and in tunnels—especially in the renovation of older tunnels, where flexibility and rapid processing are crucial. Basalt is also gaining ground in the protection of Li-ion batteries. Although the material is heavier than many alternatives, this disadvantage is often outweighed by its fire-resistant performance.
Does not rust
In places where corrosion is a major problem—such as maritime applications, construction, tunnel and bridge structures—basalt can be a valuable alternative. Basalt does not rust, lasts longer, and leaves no rust stains. Although its application is not yet widespread, the material offers great potential.
Sustainable
Basalt fabrics consist of almost 100% stone and are therefore positioned as an alternative to synthetic fibers or glass fibers. In fisheries—where synthetic nets are weighted and inevitably leave microplastics behind—basalt offers a sustainable solution. It is naturally heavy and, when it eventually breaks down or is left behind, it leaves only stone.
Not the ‘Holy Grail’ material
Unfortunately, basalt is not the ‘Holy Grail’ material we are looking for. It also has disadvantages: it is heavy, expensive, and production requires a lot of energy. In addition, it is a challenging material to process. Printing is virtually impossible; even screen printing failed in our tests.
But one thing we do know: just as nylon was the material of the future in the 1960s—and therefore the material of the first flag on the moon—a flag of the future today might well be made of basalt.
In this video, Ilse De Roos, Industrial Engineer at Basaltex, explains what basalt actually is and why we should definitely know about it.
Future and potential
The rise of technical textiles, the growing focus on sustainability and environmentally friendly materials, and the increasing demand for high-performance composites make basalt fiber a serious candidate for further growth.
Thanks to players such as Basaltex—and international producers—basalt fiber can gradually gain ground in niches where performance, safety, and sustainability are crucial: construction, infrastructure, fire safety, composites, industrial applications, insulation, and more.
In addition, examples from both literature and industry show that basalt fiber can be a realistic alternative to glass fiber, and in some cases even to more expensive high-tech fibers such as carbon fiber, when price and performance need to be balanced.
Conclusion
Basalt fiber is a fascinating example of how an “ancient” material—volcanic rock—can be transformed into a modern, high-performance fiber with properties that surpass those of traditional textile fibers. For technical applications, fire protection, insulation, composites, and sustainable materials, basalt textiles are a promising alternative.
The fact that production takes place in Belgium—via Basaltex—underscores both the potential and the reality of this innovation. Although basalt fiber will not yet compete with synthetic materials and glass fiber today, it undeniably has its place in the world of technical and industrial textiles.
